Modeling of condensation heat transfer of pure refrigerants in micro-fin tubes

Modeling of condensation heat transfer of refrigerant mixture in micro-fin tubes

“…The new refrigerant-mixture model presented in this paper is based on the model for pure-refrigerant developed by Chamra et al [9]. The pure-refrigerant model developed by Chamra et al [9] was based on a theoretical analysis of turbulent film condensation inside smooth tubes.…”

“…The pure-refrigerant model developed by Chamra et al [9] was based on a theoretical analysis of turbulent film condensation inside smooth tubes. The flow was assumed to be in the annular regime over the length of the tube.…”

“…After the invention of the micro-fin tubes, researchers have tried to account for the heat transfer enhancement due to the presence of the micro-fins by introducing new parameters and generating new empirical constants to their original smooth tube correlations. Cavallini et al [1], Yu and Koyama [3], Kedziersky and Goncalves [4], and Chamra et al [9] among others have developed models to predict the condensation heat transfer of refrigerants in micro-fin tubes.…”

Experimental Investigation of the Condensation Heat Transfer Coefficient of R134a inside Horizontal Smooth and Micro-Fin Tubes

“…improve the heat transfer efficiency primarily by adjusting the structural parameters. There are a lot of mathematical models [13][14][15][16][17][18][19][20] for predicting the heat transfer coefficient inside the enhanced tube. For example, Cavallini et al [13] presented a computational procedure for the heat transfer coefficient inside the enhanced tube based on the Cavallini and Zecchin equation.…”

“…Goto et al [15] proposed an empirical correlation to predict the heat transfer coefficient inside various kinds of micro-fin tubes based on Koyama and Yu's correlation. Chamra et al [16] presented a semi-empirical condensation model for the heat transfer coefficient inside the micro-fin tubes. Kedzierski et al [17] concluded correlations of both heat transfer and pressure drop measurements in the micro-fin tube.…”